CN113202984A - Nano composite heat-insulating nodular cast iron heat supply pipeline system - Google Patents
Nano composite heat-insulating nodular cast iron heat supply pipeline system Download PDFInfo
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- CN113202984A CN113202984A CN202110683412.XA CN202110683412A CN113202984A CN 113202984 A CN113202984 A CN 113202984A CN 202110683412 A CN202110683412 A CN 202110683412A CN 113202984 A CN113202984 A CN 113202984A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
- F16L1/036—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being composed of sections of short length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
- F16L21/022—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings used with sleeves or nipples for pipes of the same diameter, or with reduction pieces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
- F16L21/03—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/14—Joints for pipes of different diameters or cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to a nano composite heat-insulating nodular cast iron heat supply pipeline system. The invention provides a mounting process method of uncompensated, weldless, repaired mouth-free, cold mounting and original backfilling of a nano composite heat-insulating nodular cast iron heat supply pipeline system, which adopts a layered spraying process of a heat-insulating layer, sequentially sprays a nano aerogel base layer and a polyurethane composite layer on the nodular cast iron heat supply pipeline, and winds a polyethylene outer protective layer outside. The nano aerogel has the advantages of low heat conductivity coefficient, good heat insulation performance, good hydrophobic performance, corrosion resistance, aging resistance and high stability as a spraying base layer, and compared with materials such as polyurethane, the nano aerogel has more advantages in the heat insulation performance of a high-temperature section, so that the thickness of the whole heat insulation layer is reduced, the pipeline and the heat insulation material are protected, the low resistance, long service life and recoverability of the nodular cast iron pipe are utilized, compared with the prior art, the service life of a pipeline system is prolonged to more than 50 years, the heat loss of the system is reduced by 5 percent, and the engineering cost is reduced by more than 10 percent.
Description
Technical Field
The invention relates to the technical field of heat-insulating pipelines, in particular to a nano composite heat-insulating nodular cast iron heat-supplying pipeline system.
Background
The existing prefabricated heat-insulation nodular cast iron pipeline mainly comprises two manufacturing processes of a polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried heat-insulation pipe and a rigid polyurethane spraying polyethylene winding prefabricated direct-buried heat-insulation pipe. The two prefabricated direct-buried heat-insulating pipes are both composed of nodular cast iron pipes, polyurethane heat-insulating layers and polyethylene outer protective layers.
However, the existing heat supply pipeline faces the problems of safety and service life, the existing pipeline has unsatisfactory heat insulation effect, short service life and poor waterproof performance, and the accident potential of the heat distribution pipeline is aggravated by the carbonization and aging acceleration of polyurethane which is the existing heat insulation material. In view of the above, the present invention is especially proposed!
Disclosure of Invention
The invention aims to provide a nanocomposite heat-insulation nodular cast iron heat supply pipeline system of a nanocomposite heat-insulation nodular cast iron heat supply pipeline system, which aims to solve the problems of unsatisfactory heat-insulation effect, short service life and poor waterproof performance of the conventional nodular cast iron heat supply pipeline system and is mainly realized by the following technical scheme:
a nanometer composite heat-insulating nodular cast iron heat supply pipeline system comprises a nodular cast iron pipeline, a nanometer aerogel heat-insulating layer, a composite polyurethane heat-insulating layer and a polyethylene outer protective layer;
the nodular cast iron pipeline, the nano aerogel heat insulation layer, the composite polyurethane heat insulation layer and the polyethylene outer protection layer are sequentially arranged from inside to outside.
Preferably, the method further comprises the step of spraying a nano aerogel heat-insulating layer on the nodular cast iron pipeline only, wherein the nano aerogel heat-insulating layer is sprayed outside the nodular cast iron pipeline to serve as a heat-insulating layer and an outer protective layer.
Preferably, the polyurethane composite layer can be a polyurethane material, or a composite material prepared by 10% -30% of nano-pore aerogel and polyurethane according to the proportion.
Preferably, the composite polyurethane thermal insulation layer further comprises a sensing optical fiber, wherein the sensing optical fiber is arranged in the composite polyurethane thermal insulation layer and is close to the junction of the nano aerogel base layer and the polyurethane composite layer.
Preferably, an inner lining resistance reducing layer is arranged on the inner layer of the ductile cast iron pipeline.
Preferably, a nano aerogel water-resistant layer is arranged between the composite polyurethane heat-insulating layer and the polyethylene outer protective layer.
Preferably, a socket is further arranged at the end of the nanocomposite heat-insulating nodular cast iron heat-supplying pipeline system, the socket comprises a socket part and a socket part, and the socket part is provided with a protruded nodular cast iron pipeline;
the outer diameter of the bell mouth part is a flared opening, the heat-insulating layer of the bell mouth part is aligned with the nodular cast iron pipeline, and the nodular cast iron pipeline, the nano aerogel heat-insulating layer and the polyethylene outer protective layer are sequentially arranged from inside to outside;
the nodular cast iron pipeline protruding from the socket part is a light pipe with a positioning length, and can be slidably inserted into the nodular cast iron pipeline of the socket part according to the measuring insertion length, and the measuring precision is 0.5 mm.
Preferably, the nodular cast iron pipeline with the protruded spigot part is inserted into the nodular cast iron pipeline of the socket part to leave a compensation gap.
Preferably, a high-temperature-resistant rubber ring prepared from EPDM is arranged at the joint of the nodular cast iron pipeline inserted into the socket part, wherein the nodular cast iron pipeline with the protruded socket part is inserted into the socket part, and a gap of 1-2mm is reserved between the high-temperature-resistant rubber ring and the flaring part of the socket part.
Preferably, a heat preservation part is arranged at the joint of the socket part and the socket part, a nano aerogel pad is arranged in the heat preservation part, and a flexible hot melt belt is wound outside the nano aerogel pad.
Preferably, two ends of the reducing connecting part are respectively provided with a socket part which is connected with socket parts of the pipelines at two sides; two ends of the elbow connecting part are respectively provided with a socket part which is connected with the socket parts of the pipelines at two sides; the three ends of the three-way connecting part are respectively provided with a socket part which is connected with the socket parts of the pipelines at the two sides; the connecting part is of a nano composite heat-insulating structure;
preferably, both ends of the steel valve are of socket structures, and the sockets are connected with ductile iron pipelines to form a steel-flexible connection structure.
Preferably, the nodular cast iron pipeline comprises an automatic positioning propeller which is cold-installed, uncompensated and connected without welding, the socket is accurately positioned and movably installed, the installation precision of the non-repaired mouth is less than 0.5mm, and a process method of backfilling original soil is adopted after the pipeline and the pipe fitting are installed.
Compared with the prior art, the nano composite heat-insulating nodular cast iron heat supply pipeline system provided by the invention has the following advantages:
1. nano materials and step heat preservation; the nanometer heat preservation realizes high heat-proof quality that insulates against heat, improves pipeline heat preservation attenuate rate: the heat-insulating layer adopts a layered spraying process, and the nano aerogel base layer, the polyurethane composite layer and the polyethylene outer protective layer are sequentially sprayed on the nodular cast iron heat-supplying pipeline. The spraying base layer is made of aerogel with low heat conductivity coefficient, good heat insulation performance, good hydrophobic performance and high stability, and compared with materials such as polyurethane, the nano aerogel has more advantages in heat insulation performance in a high-temperature section, so that the thickness of the whole heat insulation layer is reduced. The nanometer aerogel basic unit separates heat supply pipeline and polyurethane composite bed, realizes the step and insulates against heat to utilize the three-dimensional grid structure of aerogel nanometer to possess excellent high temperature stability, avoid traditional material to pile up because of deformation such as vibration and cause the thermal insulation performance decline phenomenon, protect polyurethane composite bed performance, and can effectively reduce about 5% of system's heat loss.
The rigid polyurethane foam plastic is a foam plastic taking polyurethane as a raw material, the density is 40kg/m 3-60 kg/m3, the thermal conductivity coefficient is less than or equal to 0.027W/m.K, the moisture permeability coefficient is less than or equal to 6.5 ng/(m.s.Pa), and the water absorption rate is 3% -4%. Its main performance characteristics are small heat conductivity coefficient, low density and certain hardness; the use temperature is high and generally can reach 100 ℃, and the maximum use temperature can reach 180 ℃ after the temperature-resistant auxiliary materials are added; the compressive strength is higher.
2. The waterproof performance is excellent; the nanometer aerogel has A-grade fireproof performance, excellent overall hydrophobic and waterproof performance, the hydrophobic rate is more than 90%, liquid water is isolated, and meanwhile, water vapor is allowed to pass through. The aerogel plays the effect of protection polyurethane composite bed performance, avoids the carbonization of polyurethane composite bed high temperature, causes the heat preservation hollowing and loses the heat preservation function. The end face part of the heat-insulating layer embedded in the concrete is sprayed with the nano aerogel, so that liquid water can be blocked, and meanwhile, the waterproof treatment is carried out.
3. The service life is long; the nodular cast iron pipe material has mechanical properties close to that of carbon steel, such as high mechanical strength, good toughness and the like, and has the specific corrosion resistance of cast iron, so the nodular cast iron pipe has the advantages of good corrosion resistance, good compression resistance, good extension and the like, and is suitable for the heat supply field. Meanwhile, the layered spraying technology of the nanometer aerogel base layer and the polyurethane composite layer is beneficial to prolonging the service life of the pipeline, the nanometer aerogel has good mechanical properties, compression resistance, tensile resistance, crack resistance and flexibility, resists the external force of construction and the internal stress during cold and hot alternation, does not settle and deform after long-term use, has the service life 3-5 times that of the traditional material, and prolongs the service life to more than 50 years.
4. The construction cost is low, and the construction period is short; the flexible connection has no compensation, thereby realizing cold installation of the pipeline, and having short construction period and low cost.
The heat loss is reduced by adopting nano and layered composite heat preservation, the service life is prolonged, the input-output cost performance is high, and the economy is good: the nanometer aerogel is low in density, easy to construct, easy to process and cut into any shape and size, and is 1/3-1/5 heat preservation thickness of traditional heat preservation materials, the pipeline heat preservation layer thinning rate improves the space utilization rate, saves outer heat preservation and protection materials, reduces the initial investment of pipelines, reduces the transportation, storage cost and construction cost, and simultaneously, combines the nanometer aerogel as a base layer and a polyurethane composite layer, so that the heat preservation benefit is economically optimized.
The nano aerogel product is made of inorganic materials, does not contain harmful substances to human bodies, and does not corrode equipment and pipelines. Meanwhile, the nano-pore aerogel and polyurethane composite heat insulation product reduces the density of the composite material and improves the heat insulation performance, the fireproof performance and the impact resistance of the composite material.
The construction method of cold installation is greatly simplified: tools, instruments and equipment required for construction should be prepared before installation, the pipes should be carefully placed in the trenches using a crane, rope or other suitable tool or equipment, and the pipes and insulation should be carefully inspected for damage or other defects before installation. The invention provides an automatic positioning installation method, during connection, firstly, a rubber ring is placed into a socket according to a correct installation mode, a socket of a heat-insulating pipe is aligned with the socket, then the socket of the heat-insulating pipe is slowly pushed into the socket, and the socket is inserted into the middle of 2 socket lines. The construction method adopts green construction, and has the characteristics of no welding, no compensation, no joint coating, no flaw detection, original backfilling and the like, and can reduce the engineering cost by over 10 percent.
5. The invention combines intelligent optical fiber sensing with a nano composite heat-insulating nodular cast iron heat supply pipeline system, and realizes multifunctional optical fiber sensing for positioning the pipeline, monitoring vibration and monitoring water leakage.
6. The ductile cast iron pipe adopts a slide-in flexible socket joint, and each section of ductile cast iron pipe can be used as a compensator. The coefficient of linear expansion of the nodular cast iron material is about 11.2 multiplied by 10 < -6 > m/(m DEG C.), and the length of a single branch pipe of the nodular cast iron pipe has 2 specifications, namely 6m and 8.15 m. Even if the pipeline temperature difference is 100 ℃, when the length of the single branch pipe is 8.15m, the thermal expansion amount of the single branch pipe is only 9.2mm, the installation clearance of the nodular cast iron pipe can reach 20mm at most, and the interface can completely keep a good sealing effect under the clearance. Therefore, when the ductile cast iron pipe heat preservation pipe is installed, the installation clearance of 10mm is reserved for each interface by controlling according to the mark of the socket line, thermal compensation is carried out by utilizing the installation clearance of the flexible interface, a compensation device does not need to be arranged in the heat supply pipeline, the pipeline is enabled to run safely and stably in a hot state, and the safety running reliability is improved. The temperature difference of the water return pipeline is 30-50 ℃, so that the water return pipeline is safer and more reliable.
7. Unlike steel pipes, ductile iron pipes are flexibly connected, and the pipe sections are not welded.
The interfaces of the ductile iron pipes are connected by high-temperature-resistant rubber rings, the outer walls of the sockets of the ductile iron pipes extrude the rubber rings arranged in the sockets to be compressed and deformed to generate certain contact pressure, when the water pressure in the pipeline is increased, the water pressure can generate certain pressure on the rubber rings, the larger the water pressure is, the larger the pressure on the rubber rings is, so that the rubber rings generate self-sealing effect, can bear high pressure without water leakage, and keep good interface sealing performance.
Ethylene propylene rubber EPDM, ethylene propylene rubber have excellent aging resistance, weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical property, oil filling property and normal temperature fluidity. The ethylene propylene rubber product can be used for a long time at 120 ℃ and can be used for a short time or intermittently at 150-200 ℃. The addition of proper antioxidant can raise its use temperature. The ethylene propylene rubber has excellent steam resistance and heat resistance. After soaking in 125 ℃ superheated water for 15 months, the mechanical property change is very small, and the volume expansion rate is only 0.3 percent.
Elasticity: because the molecular structure of the ethylene propylene rubber has no polar substituent, the molecular cohesive energy is low, the molecular chain can keep flexibility in a wider range, is second to natural rubber and cis-butadiene rubber, and can still keep the flexibility at low temperature.
8. The roughness K of the nodular cast iron pipe is less than or equal to 0.1mm, and no lining is arranged; compared with a steel pipe K which is 0.5mm, the resistance of the pipe network is reduced by more than 40%; after the resistance-reducing lining is adopted, the low resistance is further realized, and the power consumption of transmission and distribution is reduced.
Drawings
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and wherein the illustrated embodiments and descriptions thereof are intended to illustrate and not limit the invention, wherein:
fig. 1 is a schematic structural diagram of a nanocomposite heat-insulating nodular cast iron heat supply pipeline system according to an embodiment of the invention.
Fig. 2 is a cross-sectional view of a nanocomposite insulation nodular cast iron heat supply pipeline system according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a nanocomposite heat-insulating nodular cast iron heat supply pipeline system according to the second embodiment of the invention.
Fig. 4 is a cross-sectional view of a nanocomposite insulation nodular cast iron heat supply pipeline system according to the second embodiment of the invention.
Fig. 5 is a schematic structural diagram of a bell and spigot in a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system in the third embodiment of the invention.
Fig. 6 is a schematic structural diagram of a bell and spigot joint without a patch in a nanocomposite heat-insulating nodular cast iron heat supply pipeline system in the fourth embodiment of the invention.
Fig. 7 is a schematic structural diagram of a bell and spigot applied to a variable diameter pipeline in a nanocomposite heat-insulating nodular cast iron heat supply pipeline system in an embodiment of the invention.
Fig. 8 is a schematic structural diagram of a bell and spigot applied to an elbow pipeline in a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system according to a sixth embodiment of the invention.
Fig. 9 is a schematic structural diagram of a tee pipeline to which a socket in a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system is applied according to a seventh embodiment of the invention.
Fig. 10 is a schematic structural diagram of a nanocomposite heat-insulating nodular cast iron heat supply pipeline system according to an eighth embodiment of the invention.
Fig. 11 is a cross-sectional view of a nanocomposite insulation nodular cast iron heat supply pipeline system according to the eighth embodiment of the invention.
Fig. 12 is a schematic structural diagram of a nanocomposite heat-insulating nodular cast iron heat supply pipeline system in the ninth embodiment of the invention.
Fig. 13 is a cross-sectional view of a nanocomposite insulation nodular cast iron heat supply piping system of the ninth embodiment of the invention.
Fig. 14 is a schematic structural diagram of a socket in a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system applied to a steel valve in an embodiment of the invention.
Fig. 15 is a schematic view of an automatic positioning propeller used in process installation in a nanocomposite heat-insulating nodular cast iron heat supply pipeline system according to an eleventh embodiment of the invention.
The reference numerals have the following specific meanings:
0-lining drag reduction layer; 1-nodular cast iron pipes; 2-nano aerogel heat insulation layer; 3-a composite polyurethane heat-insulating layer; 4-a polyethylene outer jacket; 5-bell and spigot joint; 6-an optical fiber; 7-high temperature resistant rubber ring; 8-compensating for backlash; 9-nano aerogel water-resistant layer; 10-ball valve; 12-flange connection; 13-skid; 14-steel wire rope with outer rubber tube; 16-automatic positioning of the pusher; 18-polyethylene wrap tape; 19-nano aerogel pad.
Detailed Description
Example one
As shown in fig. 1 and fig. 2, a nano composite heat-insulating nodular cast iron heat supply pipeline system according to an embodiment of the present invention includes a nodular cast iron pipeline, a nano aerogel heat-insulating layer, a composite polyurethane heat-insulating layer, and a polyethylene outer protective layer; the nodular cast iron pipeline, the nano aerogel heat insulation layer, the composite polyurethane heat insulation layer and the polyethylene outer protection layer are sequentially arranged from inside to outside. The composite polyurethane heat-insulating layer can be made of polyurethane or a composite material prepared by 10-30% of nano-pore aerogel and polyurethane in proportion. In addition, the nanometer heat preservation and heat insulation realizes high heat insulation performance, and the thinning rate of the pipeline heat preservation layer is improved: the heat-insulating layer adopts a layered spraying process, and the nano aerogel base layer, the polyurethane composite layer and the polyethylene outer protective layer are sequentially sprayed on the nodular cast iron heat-supplying pipeline. The spraying base layer is made of aerogel with low heat conductivity coefficient, good heat insulation performance, good hydrophobic performance and high stability, and compared with materials such as polyurethane, the nano aerogel has more advantages in heat insulation performance in a high-temperature section, so that the thickness of the whole heat insulation layer is reduced. The nanometer aerogel basic unit separates heat supply pipeline and polyurethane composite bed, realizes that the step is thermal-insulated to utilize the three-dimensional grid structure of aerogel nanometer to possess excellent high temperature stability, avoid traditional material to pile up because of deformation such as vibration and cause the thermal insulation performance decline phenomenon, protection polyurethane composite bed performance.
Example two
As shown in fig. 3 and 4, a second embodiment of the present invention provides a nano composite heat-insulating nodular cast iron heat supply pipeline system, which includes a nodular cast iron pipeline, a nano aerogel heat-insulating layer, a composite polyurethane heat-insulating layer, a polyethylene outer protective layer, and a sensing optical fiber; the nodular cast iron pipeline, the nano aerogel heat insulation layer, the composite polyurethane heat insulation layer and the polyethylene outer protection layer are sequentially arranged from inside to outside. The sensing optical fiber is arranged in the composite polyurethane heat-insulating layer and close to the junction of the nanometer aerogel base layer and the polyurethane composite layer, positioning information, vibration change and temperature change are obtained through signal processing of the optical fiber sensor, hydrogel is coated on the outer surface of the optical fiber, the tiny leakage of the heating pipeline is sensed in time, or the optical fiber is arranged in parallel along with the outside of the nodular cast iron heating pipeline. The sensing optical fiber joint arranged in the pipeline adopts a prefabricated joint, uses a flexible connection mode, namely, a plug-in connection mode, and is directly inserted into the adapter, and the adapter is used for connecting two adjacent pipeline sections. In addition, in other embodiments of the invention, the optical fibers can also be arranged in parallel outside the nodular cast iron heat supply pipeline.
EXAMPLE III
As shown in fig. 5, a schematic structural diagram of a socket in a nanocomposite heat-preservation nodular cast iron heat supply pipeline system is provided in the third embodiment of the present invention, the socket is arranged at an end of the nanocomposite heat-preservation nodular cast iron heat supply pipeline system, the socket comprises a socket part and a socket part, and the socket part is provided with a protruded nodular cast iron pipeline; the socket part is sequentially provided with a nodular cast iron pipeline, a nano aerogel heat insulation layer and a polyethylene outer protection layer from inside to outside; the nodular cast iron pipeline with the protruding socket part can be slidably inserted into the nodular cast iron pipeline with the socket part. The nodular cast iron pipeline with the protruded socket part is inserted into the nodular cast iron pipeline with the socket part to leave a compensation gap; the compensation clearance of the water return pipe is 5-10mm, and the compensation clearance of the water supply pipe is 10-15 mm. And a high-temperature-resistant rubber ring is arranged at the joint of the nodular cast iron pipeline with the protruding spigot part inserted into the nodular cast iron pipeline with the socket part, and the high-temperature-resistant rubber ring is prepared from EPDM (ethylene-propylene-diene monomer).
In the invention, the ductile cast iron pipe adopts a slide-in flexible socket joint, and each section of ductile cast iron pipe can be used as a compensator. The coefficient of linear expansion of the nodular cast iron material is about 11.2 multiplied by 10 < -6 > m/(m DEG C.), and the length of a single branch pipe of the nodular cast iron pipe has 2 specifications, namely 6m and 8.15 m. Even if the pipeline temperature difference is 100 ℃, when the length of the single branch pipe is 8.15m, the thermal expansion amount of the single branch pipe is only 9.2mm, the installation clearance of the nodular cast iron pipe can reach 20mm at most, and the interface can completely keep a good sealing effect under the clearance. Therefore, when the ductile cast iron pipe heat preservation pipe is installed, the installation clearance of 5-15mm is reserved for each interface (the compensation clearance of the water return pipe is 5-10mm, and the compensation clearance of the water supply pipe is 10-15mm) according to the socket line mark, the installation clearance of the flexible interface is utilized for thermal compensation, a compensation device does not need to be arranged in the heat supply pipeline, the pipeline can safely and stably operate in a hot state, and the safe operation reliability is improved. The temperature difference of the water return pipeline is 30-50 ℃, so that the water return pipeline is safer and more reliable.
Example four
As shown in fig. 6, a schematic diagram of a bell and spigot joint non-repaired structure in a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system is provided in the fourth embodiment of the present invention, and a heat-insulating treatment process for connecting a nano-material spraying pipe fitting without a repaired mouth is added on the basis of the third embodiment, that is, a heat-insulating part is provided at the joint of the bell mouth part and the spigot part, a nano aerogel cushion is provided in the heat-insulating part, and a polyethylene winding tape is wound outside the nano aerogel cushion. The joint heat-preservation treatment process for the pipe fitting without the repaired mouth and sprayed with the nano material, provided by the invention, has the advantages that the prefabricated heat-preservation integration from the socket part, the pipeline to the socket part is realized, the outer diameter of the heat-preservation port from the pipeline to the socket part is consistent, the heat-preservation thickness at the socket part is reduced, the nano aerogel cushion is adopted at the junction of the socket part and the socket part, the extrusion damage of the expansion of the pipeline to the material of the heat-preservation layer is avoided, and then the polyethylene outer protective layer or the hot-melting and electric-melting sleeve type outer protective layer is wound.
EXAMPLE five
As shown in fig. 7, a fifth embodiment of the present invention provides a schematic structural diagram of a bell and spigot in a nanocomposite heat-insulating nodular cast iron heat supply pipeline system applied to a variable diameter pipeline.
EXAMPLE six
As shown in fig. 8, a schematic structural diagram of an elbow pipe to which a socket in a nanocomposite heat-insulating nodular cast iron heat supply pipeline system is applied is provided in the sixth embodiment of the present invention.
EXAMPLE seven
As shown in fig. 9, a seventh embodiment of the present invention provides a schematic structural diagram of a tee pipeline to which a socket in a nanocomposite heat-insulating nodular cast iron heat supply pipeline system is applied.
Example eight
As shown in fig. 10 and 11, an eighth embodiment of the present invention provides a nanocomposite heat-insulating nodular cast iron heat-supplying pipeline system, which includes a nodular cast iron pipeline, a nano aerogel heat-insulating layer, a composite polyurethane heat-insulating layer, and a polyethylene outer protective layer; the nodular cast iron pipeline, the nano aerogel heat insulation layer, the composite polyurethane heat insulation layer and the polyethylene outer protection layer are sequentially arranged from inside to outside. And a nano aerogel waterproof layer is arranged between the composite polyurethane heat-insulating layer and the polyethylene outer protective layer. The nanometer aerogel has A-grade fireproof performance, excellent overall hydrophobic and waterproof performance, the hydrophobic rate is more than 90%, liquid water is isolated, and meanwhile, water vapor is allowed to pass through. The nano aerogel water-blocking layer plays a role in protecting the performance of the polyurethane composite layer, and the phenomenon that the heat-insulating layer is hollowed to lose the heat-insulating function due to the fact that the polyurethane composite layer is carbonized at high temperature is avoided.
Example nine
As shown in fig. 12 and 13, a nanocomposite heat-insulating nodular cast iron heat-supplying pipeline system provided by the ninth embodiment of the invention includes a nodular cast iron pipeline, a nano aerogel heat-insulating layer, a composite polyurethane heat-insulating layer and a polyethylene outer protective layer; the nodular cast iron pipeline, the nano aerogel heat insulation layer, the composite polyurethane heat insulation layer and the polyethylene outer protection layer are sequentially arranged from inside to outside. And an inner lining resistance reducing layer is arranged on the inner layer of the nodular cast iron pipeline. In the invention, the roughness K of the nodular cast iron pipe is less than or equal to 0.1mm, and no lining is arranged; compared with a steel pipe K which is 0.5mm, the resistance of the pipe network is reduced by more than 40%; after the embodiment adopts the lining resistance reducing layer, low resistance is further realized, and power consumption of transmission and distribution is reduced.
Example ten
As shown in fig. 14, an embodiment of the present invention provides a schematic structural diagram of a steel valve to which a socket in a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system is applied. The two ends of the steel valve are of socket structures, and the sockets are connected with ductile iron pipelines to form a flexible steel connection structure.
EXAMPLE eleven
As shown in fig. 15, an eleventh embodiment of the present invention provides a process installation method for a nanocomposite heat-insulating nodular cast iron heat-supply pipeline system, including: the automatic positioning propeller is characterized in that a bell and spigot is accurately positioned and movably mounted, the mounting precision of a patch-free port is less than 0.5mm, and a process method of backfilling original soil is adopted after the pipelines and pipe fittings are mounted.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A nanometer composite heat-insulating nodular cast iron heat supply pipeline system is characterized by comprising a nodular cast iron pipeline, a nanometer aerogel heat-insulating layer, a composite polyurethane heat-insulating layer and a polyethylene outer protective layer;
the nodular cast iron pipeline, the nano aerogel heat insulation layer, the composite polyurethane heat insulation layer and the polyethylene outer protection layer are sequentially arranged from inside to outside.
2. The system of claim 1, further comprising a nano aerogel thermal insulation layer sprayed only on the nodular cast iron pipeline, wherein the nano aerogel thermal insulation layer is sprayed outside the nodular cast iron pipeline as an insulation layer and an outer protective layer.
3. The nanocomposite heat-insulating nodular cast iron heat supply pipeline system according to claim 2, wherein the polyurethane composite layer can be polyurethane or a composite material prepared by 10% -30% of nano-pore aerogel and polyurethane.
4. The nanocomposite, insulated, nodular cast iron heating pipeline system of claim 3, further comprising a sensing fiber disposed within the composite polyurethane insulation layer and near the interface of the nano aerogel base layer and the polyurethane composite layer.
5. The nanocomposite insulation nodular cast iron heating pipeline system of claim 4, wherein an inner lining drag reduction layer is arranged on the inner layer of the nodular cast iron pipeline.
6. The nanocomposite insulation nodular cast iron heating pipeline system of claim 5, wherein a nano aerogel water barrier is provided between the composite polyurethane insulation layer and the polyethylene outer jacket.
7. The nanocomposite insulation nodular cast iron heating pipeline system of claim 6, wherein a socket is further provided at an end of the nanocomposite insulation nodular cast iron heating pipeline system, the socket comprises a spigot portion and a socket portion, the spigot portion is provided with a protruded nodular cast iron pipeline;
the outer diameter of the bell mouth part is a flared opening, the heat-insulating layer of the bell mouth part is aligned with the nodular cast iron pipeline, and the nodular cast iron pipeline, the nano aerogel heat-insulating layer and the polyethylene outer protective layer are sequentially arranged from inside to outside;
the nodular cast iron pipeline protruding from the socket part is a light pipe with a positioning length, and can be slidably inserted into the nodular cast iron pipeline of the socket part according to the measuring insertion length, and the measuring precision is 0.5 mm.
8. The system of claim 7, wherein the ductile iron pipe with the protruding spigot portion is inserted into the ductile iron pipe of the socket portion with a compensation gap.
9. The nanocomposite insulation nodular cast iron heating pipeline system of claim 8, wherein the joint of the nodular cast iron pipeline with the protruded spigot part inserted into the nodular cast iron pipeline of the socket part is provided with a high temperature resistant rubber ring made of EPDM, and a gap of 1-2mm is left between the high temperature resistant rubber ring and the flaring part of the socket part.
10. The nanocomposite insulation nodular cast iron heating pipeline system according to claim 9, wherein a thermal insulation part is arranged at the joint of the socket part and the spigot part, a nano aerogel pad is arranged in the thermal insulation part, and a flexible hot melt tape is wound outside the nano aerogel pad.
11. The nanocomposite heat-insulating nodular cast iron heat supply pipeline system according to claim 7, wherein two ends of the reducing connecting part are respectively provided with a socket part which is connected with the socket parts of the pipelines at two sides; two ends of the elbow connecting part are respectively provided with a socket part which is connected with the socket parts of the pipelines at two sides; the three ends of the three-way connecting part are respectively provided with a socket part which is connected with the socket parts of the pipelines at the two sides; the connecting part is of a nano composite heat insulation structure.
12. The system of claim 7, wherein the steel valve has a bell mouth structure at each end, and the sockets are connected to the ductile iron pipes to form a flexible steel connection structure.
13. The nanocomposite insulation nodular cast iron heat supply pipeline system of claim 1 wherein the nodular cast iron pipeline includes a cold-installed, uncompensated, weldless connection auto-positioning thruster, precision positioning bell and spigot mobile installation, no-patch installation precision less than 0.5mm, and the pipeline and pipe installation is backfilled with original soil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115183314A (en) * | 2022-06-14 | 2022-10-14 | 临汾市热力供应有限公司 | Structure of distributed load prediction intelligent control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115183314A (en) * | 2022-06-14 | 2022-10-14 | 临汾市热力供应有限公司 | Structure of distributed load prediction intelligent control system |
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